DE102017202941A1 - Method and device for operating a screen printing machine - Google Patents

Abstract

When operating a screen printing unit in a printing press with a screen printing plate carrying a screen cylinder in which a doctor is turned on and off against the screen form from inside, and which is employed against a counter-pressure cylinder to form a pressure point and turned off by this to form a gap of this , The screen cylinder is parked in a first phase with the blade off by the impression cylinder. In a second phase, one or more substrate sheets are conveyed with at least temporarily employed screen cylinder through the pressure point, before finally for subsequent printing material sheet in a third phase operation with permanent or cyclic per substrate sheet at least once employed squeegee.

Description

The invention relates to a method and a device for operating a screen printing machine according to claim 1 or 19.

WO 2016/102187 A1 discloses a rotary screen printing machine with a first and a second screen cylinder, which forms two pressure points with an impression cylinder. Between the first and second pressure point a directed onto the lateral surface of the impression cylinder radiation dryer is provided. A raked in Siebdruckzylinder doctor blade is by a drive mechanically independent of the rotation of screen and impression cylinder from the inside against the screen printing on and off this.

When the screen printing cylinder is turned off, there may be a lack of color reduction and possibly present rotation to undesirable color build-up on the Siebaußenseite, which can lead to unwanted contamination on the impression cylinder at the end with large layer thicknesses by contact with the impression cylinder surface or when printing the first sheet. This is particularly damaging in the event that an intermediate drying takes place through a directed to the cylinder surface dryer. This quickly leads to a color build-up. The dried paint becomes hard especially in intermediate drying, forming peaks and can cause damage to the screen printing form. The thus cured ink is very difficult to remove again from the cylinder surface.

The invention has for its object to provide an improved method and an improved apparatus for operating a screen printing machine.

The object is achieved by the features of claim 1 or or 19.

The achievable with the present invention consist in particular that the effort cleaning the impression cylinder and / or the risk of damage to the screen form can be significantly reduced. By Anstellsequenz is collected on Siebdruckäußeren with ink screen printing cylinder accumulating ink removed before distributed by hiring the squeegee the built-up ink at undesirable locations of the sheet and / or impression cylinder .. It is advantageous if by lower operating speeds in the print-Ab the push through the ink is reduced.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

• 1 ein Ausführungsbeispiel für eine ein Druckaggregat umfassende Druckmaschine;
• 2 eine detailliertere vergrößerte Darstellung des Ausführungsbeispiels für ein Druckaggregat aus 1 in a) bogenverarbeitender und b) in bahnverarbeitender Ausführung;
• 3 eine schematische Querschnittsdarstellung durch ein Gegendruck- und/oder Transportzylindersegment;
• 4 eine schematisch dargestellte Abwicklung eines Mantelflächensegmentes des Gegendruck- und/oder Transportzylinders;
• 5 eine Prinzipskizze für a) die Abfolge von Phasen innerhalb einer An- und Abstellsequenz sowie b) der zugehörigen, den Antrieb betreffenden Betriebszustände;
• 6 eine Prinzipskizze für die Abfolge von Phasen innerhalb einer An- und Abstellsequenz für a) ein größeres und b) ein kleineres Bedruckstoffformat;
• 7 eine Prinzipskizze für die Abfolge von Phasen innerhalb einer An- und Abstellsequenz in Abhängigkeit von Lage und Länge der vorliegenden Druckbildlänge (L_B);
• 8 eine Prinzipskizze für die Abfolge von Phasen innerhalb einer An- und Abstellsequenz in Abhängigkeit von Lage, Länge und Anzahl der in einer Druckbildlänge vorliegenden Druckstreifen;
• 9 eine schematischen Darstellung einer eine Antriebseinrichtung und eine Steuereinrichtung umfassenden Rakeleinrichtung;
• 10 eine schematische Darstellung für den Betrieb eines Siebdruckwerkes nach einer Produktionsunterbrechung;
• 11 eine schematische Darstellung für das Herunterfahren eines Siebdruckwerkes bei fehlerbedingter Produktionsunterbrechung.

Show it:

• 1 an embodiment of a printing machine comprising a printing press;
• 2 a more detailed enlarged view of the embodiment of a printing unit 1 in a) sheet processing and b) in sheet processing design;
• 3 a schematic cross-sectional view through a counter-pressure and / or transport cylinder segment;
• 4 a schematically illustrated development of a lateral surface segment of the counter-pressure and / or transport cylinder;
• 5 a schematic diagram of a) the sequence of phases within a startup and Abstellsequenz and b) the associated operating conditions related to the drive;
• 6 a schematic diagram for the sequence of phases within an on and Abstellsequenz for a) a larger and b) a smaller substrate format;
• 7 a schematic diagram for the sequence of phases within an on and Abstellsequenz depending on the position and length of the existing print image length (L _B );
• 8th a schematic diagram for the sequence of phases within an on and Abstellsequenz depending on the position, length and number of present in a print image length pressure strip;
• 9 a schematic representation of a drive means and a control device comprising a doctor device;
• 10 a schematic representation of the operation of a screen printing after a production interruption;
• 11 a schematic representation of the shutdown of a screen printing unit in case of faulty production interruption.

A printing machine, z. As a sheet-fed press or a web-fed printing press, the input side comprises a feeder 01 through which the printing press with a sheet or web-shaped substrate 02 is supplied, at least one printing unit 03 through which the printing material 02 one or both sides one or more times printing, and a product display 04 on which printed products or intermediates are stacked or continuously laid or wound up as a roll (see, for example, US Pat. 1 ).

In a preferred embodiment set forth in the figures, the printing machine is used as a printing machine for printing securities, For example, for printing web-shaped substrate 02 , z. B. a printing substrate, or preferably for printing sheet-like substrate 02 , z. B. substrate sheet 02 , executed. The feeder 01 for the latter embodiment is z. B. as a sheet feeder 01 formed, in which a stack of supplied and to be printed substrate sheets 02 can be ordered.

The printing unit 03 the z. B. as a security printing machine formed printing machine is the substrate 02 in the range of at least one pressure point 06 ; 07 formed on at least one substrate side in a screen printing process, especially in rotary screen printing, printing. The substrate to be screen printed 02 is preferred as a printing material sheet 02 and / or as already printed by another printing process substrate 02 and / or as z. As textile, linen, hemp and / or synthetic fibers comprehensive security paper and / or as a plastic substrate (polymer substrate) or as a hybrid substrate.

Preferably, the printing machine is designed as a sheet-fed printing press for security printing and z. B. trained to still unprinted or preprinted printing material 02 printed sheets, in particular securities sheets, such as. B. sheets with banknotes, as products or weiterzuverarbeitende intermediates.

The printing material sheets 02 are here z. B. as layers of a printing material stack in the sheet feeder 01 trained feeder 01 held, of which they by a not shown in detail, z. B. suction cups comprehensive gripping device 08 picked up individually and isolated over a conveyor line 09 , z. B. via a preferably as a band system 09 trained conveyor system 09 , And possibly a conditioning drum up to an entry area in the printing unit 03 be encouraged. At the entrance to the printing unit 03 For example, on a transfer drum 11 becomes the substrate sheet 02 to a the printing unit 03 associated conveyor line, z. B. a pressure unit 03 assigned conveyor system passed through which the printing material 02 along its transport path one or more bruises 06 ; 07 happened before he - for example, via a takeover drum 12 - from the printing unit 03 associated conveyor line in a third conveyor line 13 enters or to a third conveyor line 13 , z. B. a tape system 13 , and passed through this until the product delivery 04 , z. B. a one or more sheet trays for stacking comprehensive product display 04 , is transported.

In the case of a web-processing version of the printing press, the web-shaped printing material passes 02 in the area of the printing unit 03 a conveyor line which comprises one or more rollers and / or cylinders looped around the track.

In the preferred embodiment of the printing press as a sheet-processing printing machine which is the printing unit 03 associated conveyor line preferably designed as a gripper system, in which the printing material 02 by successive transfer between a plurality of successive drums and / or cylinders in the transport direction along the transport path through the printing unit 03 is encouraged. At the end of z. B. designed as a gripper system conveyor line is the printing material 02 to the third conveyor line 13 issued.

In the printing unit 03 downstream Bedruckstoffweg can one or more conditioning 14 ; 16 ; 17 For example, one or more drying facilities 14 ; 16 be provided, for. B. a first drying device 14 and another drying device 16 , and / or a device 17 for loading the printing material 02 with directional magnetic field lines.

The printing unit 03 includes at least on one side of the conveyor line at least one pressure point 06 through which the substrate 02 is printable or printed on one of his substrates. The pressure point 06 can through a nip 06 two bodies of revolution 18 ; 21 , z. B. a nip 06 between a cylinder 18 a first printing unit 19 and a cylinder 18 serving as abutment cylinder 21, z. B. a counter-pressure and / or transport cylinder 21 be formed.

Downstream of this at least one pressure point 06 can in the substrate path of the substrate 02 , especially in the pressure point 06 downstream downstream conveyor line through the pressure unit 03 a first in contact contact with the at least one pressure point 06 printed substrate side standing, the pressure point 06 downstream in the printing substrate rotational body 22 be arranged. This with the freshly printed Bedruckstoffseite cooperating rotary body 22 can z. B. as a guide and / or transport roller of the conveyor system, as a conditioning roller for cooling or heating of the printing material 02 or in particular for the formation of a further pressure point 07 as a cylinder 22 one of the former printing unit 19 subsequent printing unit 23 be executed.

Such a second pressure point 07 can by a Nippstelle 07 between the cylinder 22 of the second printing unit 23 and one as Abutment effective cylinder may be formed, the z. B. by the first printing unit 19 as counter-pressure and / or transport cylinder 21 serving cylinder 21 or a different further, effective as Gegenruck- and / or transport cylinder cylinder is formed. In Bedruckstoffweg the printing press and / or the printing unit 03 upstream or downstream one or more further such printing units acting on this same printing material side and / or one or more further printing units acting on the other printing material side may also be provided.

In the preferred embodiment of the printing machine as a sheet-processing printing machine, the at least one counterpressure and / or transport cylinder comprises 21 at its periphery at least one, preferably in succession more, z. B. three, holding devices 24 , z. B. a gripper device comprising one or a group of several grippers 24 , by which input side, the leading end of a printing material sheet 02 receivable and output side to the downstream conveyor line can be dispensed again. The gripper device 24 here is z. B. in one in the otherwise cylindrical lateral surface 27 of the cylinder 21 provided pit 26 arranged, the radially outwardly directed opening 28 , z. B. pit opening 28 , the cylinder jacket-shaped lateral surface 27 interrupts and disturbs (see eg 2a )).

In the case of a web-processing version of the printing press such holding devices 24 omitted (see, for example, 2 B )). Colloquially, the n-fold includes large cylinder 21 n Benefits, ie n perimeter sections that can be used for printing without interruption U _D ,

Regardless of the type and number n of provided in the case of sheet pressure in the circumferential direction holding devices 24 is through the respective pit opening 28 on the circumference of the counter-pressure and / or transport cylinder 21 an interruption of the otherwise undisturbed cylindrically extending lateral surface 27 conditionally.

In n-fold, ie one or more times large version includes the counter-pressure and / or transport cylinder 21 Viewed in the circumferential direction n, ie one or more usable as an abutment during printing peripheral portions U _D , in particular cylinder circumference sections U _D and n, ie one or more of the holding devices 24 comprehensive, not usable as an abutment during printing peripheral sections U _N , in particular cylinder peripheral section U _N with disturbed lateral surface 27 , The usable as abutments during printing peripheral sections U _D are colloquially referred to as so-called "saddle"

The opening 28 comprehensive, not suitable for printing and / or provided peripheral portion U _N indicates an effective length on unrolling along the continued circular line L _N which corresponds to the circular arc length reaching over the opening. The usable for printing peripheral portion U _N has a length accordingly L _N on, at the same time the possible print image length L _B limited to the top.

The non-usable as a pressure abutment peripheral portion U _N can basically be alone through the opening 28 the holding device 24 receiving pit 26 or possibly through this opening 28 and - if provided - a leading and / or trailing side subsequent functional portion, for example, an overlap region of a possibly provided on the flow side Einpräghilfe 29 (see below) and / or to be observed by setting distance to the trailing edge of the following pit opening, be given. Conversely, the usable for printing peripheral portion U _D basically by the between a leading end of the interruption, for example, the leading end of the opening 28 , and the trailing end of the circumferentially following same or next opening 28 Cylinder jacket gated given same. In the case of an irregular training of the disturbance on the lateral surface 27 leading and / or trailing side limiting contour is as a length L _N the non-printable peripheral portion U _N For example, the considered in the circumferential direction arc length between the first side and the trailing side last side of the last by the same holding device 24 conditional interruption in the undisturbed lateral surface 27 to understand.

The at least one printing unit 19 and in particular also the at least one further printing unit which cooperates with the same printing material side 23 is as a working after screen printing unit 19 ; 23 , briefly as a screen printing unit19; 23, and the printing unit 19 ; 23 assigned cylinders 18 ; 22 as a form cylinder 18 ; 22 , in particular as so-called screen cylinder 18 ; 22 , in particular as a screen printing cylinder 18 ; 22 educated.

The screen cylinder 18 ; 22 rolls on the lateral surface of the counter-pressure and / or transport cylinder 21 from and forms in the area of his above nip 06 ; 07 with the counter-pressure and / or transport cylinder 21 the pressure point 06 ; 07 out. The screen cylinder 18; 22 includes in the region of its lateral surface as a printing plate 31 ; 32 a screen form arranged concentrically with the real or imaginary cylinder axis 31 ; 32 , in particular screen printing stencil 31 ; 32 . This is in the mounted state, for example, the front side releasably secured to not shown ring flanges. The screenprint template 31 ; 32 can in principle be used as an endless cylinder-jacket or sleeve-shaped screen-printing stencil or as a finite, but in the mounted state, to form a screen printing stencil closed to form a slight impact in the circumference 31 ; 32 be executed.

Inside the form cylinder 18 ; 22 is a squeegee 34 one - z. In 9 schematically illustrated - doctor device 33 provided, which in an Anstelllage "ON" in a peripheral region of the screen cylinder 18 ; 22 from the inside against the screenprint stencil 18 is employed, in which of these the pressure point 06 ; 07 with the counter-pressure and / or transport cylinder 21 formed. This point can, for example, based on the operating direction of rotation, a maximum of 5 ° before or after the nip 06 ; 07 with the counter-pressure and / or transport cylinder 21 be provided. The doctor employed in this way 34 accumulates a bead of printing ink, which she rolls in front of her and through the permeable areas of the screen printing stencil 31 ; 32 pushes outwards.

Around after the passage of the above-mentioned opening 28 on the counter-pressure and / or transport cylinder 21 through the nip 06 ; 07 in the following peripheral section U _D Allowing for reprinting as soon as possible for printing can provide temporary and at least partial coverage of the opening 28 an above-mentioned coloring aid 29 , z. B. as a flap 29 trained cover 29 , be provided, through which the opening 28 at least in the leading area of the opening 28 is temporarily coverable. This is a premature hiring of, for example, the Nippdurchtritt the open area of the opening 28 lifted squeegee 34 allows. The cover element 29 For example, it may overlap slightly with the undisturbed cylinder jacket peripheral portion and, in this case, reduce the length L _D the maximum usable for printing peripheral portion U _D , This geometric shortening is caused by the premature hiring z. B. more than offset. Due to the premature setting can - in relation to the unrolling during operation - upstream pressure range beginning in the ideal case immediately, but possibly also a small safety distance to the cover 29 connect. For example, by the slight overlap and possibly a slight safety distance following the cover 29 conditional extension of the not usable for printing peripheral portion U _N beyond the leading edge of the opening and / or the distance of the earliest possible beginning of the pressure range to the trailing edge, for example, may be between 10 mm and 50 mm, preferably at most 30 mm.

The maximum usable length for printing L _D is limited by the machine-and / or safety-related earliest possible pressure range beginning and a machine and / or safety-related trailing side latest possible pressure range end. In this case, the latest possible end of the pressure range can basically coincide with the leading end of the following opening 28 , z. B. the leading opening edge of the following opening 28, coincide or - z. B. for reasons of safety and / or risk of contamination and / or below the length of a phase P _from for parking - by a distance to be maintained a _s to the trailing edge of the following pit opening (see, eg, schematically in FIG 3 and 4 ). The maximum usable length for printing L _D For example, by the length of the undisturbed circumference on the abutment, z. B. the counter-pressure and / or transport cylinder 21, or by other involved in printing and / or transport machine elements or by the considered in the transport and / or circumferential direction, the maximum usable for the printing length of the printing unit 19 ; 23 provided printing forms 31 ; 32, hereinafter also referred to briefly as the print length, be limited. These variables are regularly matched to one another and essentially correspond to one another.

In 1 -full execution of the counter-pressure and / or transport cylinder 21 is under the subsequent mine opening 28 here the same only pit opening 28 to understand .

Between the at least one pressure point 06 and the downstream point in the Bedruckstoffweg, where the substrate 02 on his by the bruise 06 printed side in touching contact to the subsequent rotary body 22 reaches, is in a preferred embodiment, a further drying device 36 , z. B. a dryer 36 , in particular intermediate dryer 36 provided, preferably as a radiation dryer 36 is trained. To a spatially narrow along the Bedruckstoffweges effective zone for the dryer 36 can provide a shading the radiation effect upstream and / or in particular downstream limiting 37 be provided, which, for example, by a wall 37 one the dryer 36 receiving and to the side of the substrate 02 open enclosure is given. In the as radiation dryer 36 trained embodiment of this includes a single or multi-part radiation source 38 for electromagnetic radiation, z. B. for light, in particular for UV light, ie of light with at least one predominantly lying in the UV spectral portion of emitted radiation power. The dryer 36 can be designed in particular as a UV LED dryer.

The squeegee device 33 (see for example schematically 2 and 9 ) comprises an on-and-Abstellbewegung enabling storage device of the doctor blade 34 and a drive device 39 . 41 . 48 through which the squeegee 34 with its squeegee edge - at least as far as the length and / or location of one on the cycle length L _Z related arrival and Abstellsequenz with at least one an Anstelllage "AN" and at least one relevant a parking position "AB" phase P _AN ; P _AB , short sequence, relates - cyclically correlated during operation, in particular synchronized or clocked, to the rotational position of the counterpressure and / or transport cylinder 21 and / or cyclically correlated, in particular clocked, to the position of the printing substrate 02 to be printed in the direction of transport, to the screen printing stencil 31 ; 32 of the screen printing cylinder 18 ; 22 is switched on and off or on and off. The correlation of the blade movement generally relates to a direct or indirect correlation to the machine and / or printing material phase position, ie for example to the position and / or the movement of a machine phase, in particular to a pressure point 06 ; 07 relevant phase position, and / or to a situation and / or an advance of the substrate 02 in the printing press. This machine phase can be due to the medium or directly derived angular position of the affected pressure point 06 ; 07 forming cylinder 18; 21; 22 be. The progress of the printing material 02 relevant size can by an angular position signal of the substrate 02 registering transporting machine element or a passage signal to be provided on the transport sensor.

The cycle length L _Z , is preferably given by the repetition length between two successive printing sections, ie the shortest possible distance between the leading ends of two successive print image lengths. Depending on the physical variable to be considered, it can be spatially related to a path length between two locations y or an angle Φ or temporally to the duration between two times t. Taking into account the geometry and the transport speed profile, these variables can be converted into one another and, for example, related to a relative position to the machine phase. The cycle length L _Z corresponds to the sum of the length L44 of a maximum usable for the pressure section along the transport path considered U _D and a length L _N one between two such peripheral portions U _D lying, not usable for the pressure peripheral portion U _N , The latter can be caused inter alia by interruptions in the case of sheet printing inter alia by the means for the sheet transport and for the web printing, which are caused by collisions or even gaps between the ends of clamped printing plates. For the presence of a counter-pressure and / or transport cylinder 21 corresponds to the cycle length L _Z for example, the total of the length L44 of a usable for the pressure of the peripheral portion U _D and the length L _{N of} a non-usable for the pressure peripheral portion U _N and / or the n-th part of the circumference of the n-large or n saddle comprehensive counter-pressure and / or transport cylinder 21 ,

Such a cycle length L _Z or the on-off sequence assigned to this comprises z. B. at least one phase P _AB with the squeegee turned off 34 and at least one phase P _AN with employee squeegee 34 , Here, the concept of the phase P _AN ; P _AN again relate to a spatial or temporal size. Such a cycle can be a sequence with only a single phase P _AB with the squeegee turned off 34 and a phase P _AN with an employee squeegee 34 or in a further development, a sequence with several, each of a phase P _AB with the squeegee turned off 34 interrupted phases P _AN with an employee squeegee 34 include. Due to the limited speed of movement when turning on and off the squeegee 34 can between the phase P _AN with doctor employed in actual working position 34 in which this example, not only directly up to, but with a slight deflection of z. B. at least 0.5 mm, ie a by the degree of beyond the first Berührkontakt beyond adjusting negative distance a _AN from a _AN ≤ -0.5mm, against the screen printing stencil 31 ; 32 is employed and the phase P _AB with effective shut off squeegee 34 , in which the blade edge a slight distance a _AB from Z. B. a _AB ≥ 0.2 mm, in particular 1.2 mm ≥ a _AB ≥ 0.4 mm, to the screen printing stencil 31 ; 32 takes a phase P _on of hiring or a phase P _from to be located.

Around the blurred area between actual on and off position "ON";"AB" and / or to keep the area unusable for printing as small as possible, but to allow high operating speeds without too strong, caused by the doctor blade pulses is a -. B. on the circumferentially in the inner periphery of the screen printing stencil 31 ; 32 referenced - length of the phase P _on of employment and / or phase P _from the parking z. B. between 80 mm and 200 mm, in particular between 110 mm and 150. The sum of the length of a phase P _from the parking and the length of a phase P _on however, for example, at most equal to the length of the employment L _N of the non-usable for printing peripheral portion U _N , which here, for example, at least by the viewed in the circumferential direction width of the opening 28 and the trailing edge of the pit upstream distance a _s and possibly by the length of the above-mentioned overlap of a possibly provided cover 29 given is.

The squeegee device 33 includes (see eg 9 ) a control device 39 through which the squeegee 34 in the above-mentioned correlation to the machine phase of the printing press and / or to the progress of the printing material 02 is switched on and off or on and off. In particular, by the control device 39 a the arrival and Abstellbewegung the doctor 34 causing drive means 41 in the above-mentioned correlation to the machine phase of the printing press and / or to the progress of the printing material 02 controllable in the way that the squeegee 34 alternately for one of the lengths of the phase P _AN with an employee squeegee 34 corresponding duration in Anstelllage "ON" and - in particular after a conditional by the duration of the phase change transition phase - for one of the length of the phase P _AB with the squeegee turned off 34 corresponding duration in storage position "AB" is. For this purpose, the drive means 41 in the way by the control device 39 controlled that the drive means during the phase P _AN with an employee squeegee 34 or for the corresponding duration T _AN in an operating state causing the setting position "ON" BZ _AN and during the phase P _AB with the squeegee off 34 or for the corresponding duration in an operating position "AB" causing the Anstelllage BZ _AB is located (see, for example, schematically in 5 ).

The control device 39 This can be done by a coherent or distributed control circuit 39 or by a coherent or distributed data processing means interconnected by signal technology 39 be formed, wherein it comprises switching and / or data processing means for performing an above-mentioned correlation. The control device 39 can be wholly or partly integrated into a machine control system connected with control and / or drive means of the printing machine in a different manner or else entirely or partially specially for the control of the doctor blade 34 be provided.

The said correlation of the on a cycle length L _Z related sequence to the machine phase and / or the printing material progress is z. B. by transmission of the machine phase and / or the printing material progress representing signals S _K via a signal connection 35 between the controller 39 and one the machine phase of the printing press and / or the progress of the printing material 02 representing and the squeegee control z. B. as a master 42 This can, for example, by a relevant machine phase of the printing press and / or the progress of the printing material 02 detecting sensors 42 and / or by a medium or immediate drive of the cylinder 21 controlling drive control 42 be given. In a particularly suitable for retrofitting this can be an already provided in the machine, a registergerecht anzutreibendem component, eg. B. the investment drum, associated sensors 42 be. For machines for which a plurality of transport and / or printing components or groups of components are rotatably driven by mechanically independent drive motors via a common electronic master axis, the doctor blade control as a master 42 serving master axis encoder 42 through such an electronic master axis 42 be formed, which serves as a master to several other drive motors of the printing press. This leading axis 42 can be considered a real electronic master 42 follow the rotational movement of a real angle signal or as a virtual master axis by data processing means 39 generated and specified for all coupled follower drives. The signal connection 35 is then through the coupling to the electronic master axis 42 formed and executed for example as a bus or network system.

The squeegee device 33 - in particular the said, the squeegee 34 in a correlation to the machine phase of the printing press and / or to the progress of the printing material 02 on and off control device 39 - includes control means 43 , by which a length and / or position of at least one of the Anstelllage "AN" phase in question P _AN within a repeating cycle for switching on and off as a function of information I (F) relating to the format of the printing material and / or the printed image; (I L _B ); I (M) is variable and / or varied. In particular, the information I (F) concerning the printing substrate format, in particular its length, and / or the printed image; (I L _B ); I (M) for information I (F); (I L _B ); I (M) for the substrate length considered in the transport direction L02 or to the the printing material sheet 02 relevant print image length L _B or through the printing unit 19 ; 23 printed pattern to be printed. Here, the length and location of the phase P _AN as a result, both for the circumferentially on the inside of the screen printing form 31 ; 32 measured length as well as their temporal equivalent as connected via the peripheral speed duration or temporal classification.

In a first variant, two or more discrete values or ranges of values for the relevant information I (F) can be used for the format- or image-dependent control of the phase length and / or position; I (L44); I ( _M ) a corresponding number of discrete phase lengths and / or positions for the phase P _AN with an employee squeegee 34 and / or a corresponding number of -. B. at least partially spaced apart - phase positions for the end of the phase P _AN with an employee squeegee 34 For example, in or by the control means 43 be held or provided.

In an alternative, however, it may be provided that by the control means 43 depending on one of a continuous value range of the relevant information I (F); (I L _B ); I ( _M ) value is a value for the phase length and / or position of the phase P _AN with an employee squeegee 34 or for the phase position of the end of the phase P _AN with employee squeegee 34 from a continuous - and z. B. limited up and down - value range is provided or provided. In this case, a sequence of equidistant discrete steps should be understood as "continuous", which is conditioned, for example, by restriction or rounding down to the smallest steps to be considered and / or hand-handled in the variable to be considered.

By the control device 39 a processing of the above-mentioned correlation signals takes place S _K to the arrival and Abstellbewegung the doctor 34 controlling signals S _R taking into account a specific phase length and / or position for the phase relating to the inrun position "ON" P _AN or phases P _AN within one cycle or one cycle length L _Z , The recovery and provision of the specific phase length and / or position is performed by the control means 43 depending on the printing material format, in particular its length, and / or the information characterizing and / or relevant information I (F); (I L _B ); I (M), here for example also under the superordinate name of the information concerning the printing I summarized (see eg 9 ).

The z. B. from the controller 39 for the correlated, in particular synchronized drive control means included 43 to provide the format- and / or print image-dependent phase length and / or position may in turn be formed by one or more contiguous or distributed circuit and / or data processing means, wherein there are circuit and / or data processing means for determining a Anstelllage "AN" phase length concerned and / or the phase position as a function of the obtained above-mentioned information I (F); (I L _B ); I (M) to format and / or printed image includes.

The of the control device 39 included control means 43 can - according to the control device 39 itself - in whole or in part in a control technology connected with other actuating and / or drive means of the printing press, z. B. a planning and / or management level 47 integrated machine control integrated or decentralized and spatially close to the drive means to be controlled 41 be provided.

The length and / or location of at least one phase P _AN with an employee squeegee 34 or the corresponding or temporal arrangement or a movement profile that takes into account this length or duration is determined using one of the control means 43 included assignment rule depending on the information to be used I (F); (I L _B ); I (M) determined and / or provided. The assignment rule can be in tabular or as a functional context in one of the control means 43 included computational and / or storage means 52 be held up. This should also be understood as meaning a complex rule by which I (F) depends on the information to be used; (I L _B ); I (M) is determined and / or created a movement profile taking into account the specific length and / or position.

The information I (F) determining the phase length and / or the phase end or the phase position; (I L _B ); I (M) may be the control means 43 z. B. via a signal connection 45 from the planning and / or management level 47 be made available. This may be the case, for example, for the information I (F) relating to or representing the substrate format F and / or the printed image; (I L _B ) - from one of the planning and / or management levels 47 be attributed to the console. At this is the corresponding information I (F); (I L _B ) itself or to this information I (F); (I L _B ) to be processed manually selectable or input, for example via an operator interface. In a more automated form, the information I (F); (I L _B ) or to this information I (F); (I L _B ) to be processed from already electronically in the planning and / or management level 47 or pre-press data for product and / or production planning can be obtained or be. In a particular I (especially when using the print length or the print pattern information I ( L _B ); I (M) variant, the relevant information I ( L _B ); I (M) can be obtained from data already available in the pre-press for the relevant printed image excerpt.

The term "phase length" or "phase position" can here, if not distinguishable, as a short form for the above "length" or "position" both the size or the position of the phase in question spatially (position, Angle) as well as - via the velocity profile - their temporal correspondence as duration or relative position within the synchronized cycle length L _Z be taken or be. The times for the respective phase change and thus the phase length and the phase position are z. B. determined relative to the machine phase position and / or the printing material phase position.

In a first embodiment of the embodiment of the control means 43 or for controlling the blade movement, z. In 6 schematically based on a side view of a usable peripheral portion U _D comprehensive cylinder jacket processing indicated, for example, in a first operating situation printing material sections of a first format F.1 ie with a first substrate surface L02 , 1, and in a second operating situation printing material sections 02 a second format F.2 ie with a second bed of printing material L02 , 1 can be printed or printed. Depending on the respective printing substrate L02 ,1; L02.2 or information I (F) representing this length becomes the phase length of the phase P _AN with an employee squeegee 34 or, preferably for this case, an end of the phase P _AN with an employee squeegee 34 by the control device 39 determined and / or it is carried out depending on the respective Bedruckstoffläge L02 ,1; L02.2 or representing this length information I (F) on and off the squeegee 34 in a particular cycle Z1 ; Z2 (see eg 5 ), in which the differing Bedruckstofflägen L02 ,1; L02.2 different phase lengths for each phase P _AN with an employee squeegee 34 or - preferred for this case - different phase positions for the end of the respective phase P _AN with an employee squeegee 34 are assigned. The phase position for the beginning of the respective phase P _AN with an employee squeegee 34 can each have a same and z. B. fixed, but may be changed if necessary. This can, for example, in the manner outlined above, even before the start of the usable for printing peripheral portion U _N lie.

In a second, possibly instead of or optionally for the first embodiment feasible or providable embodiment, for. In 7 schematically based on a side view of a usable peripheral portion U _D comprehensive cylinder jacket processing indicated, the phase length of the phase P _AN with an employee squeegee 34 or at least an end to the phase P _AN with an employee squeegee 34 by the control device 39 as a function of the respective print image length L _B or an information I representing this length ( L _B ) certainly. Under the print image length L _B should z. B. in this case be understood that length, the flow side by the first and return side by the last by the pressure point 06 ; 07 is limited to be supplied color. The intermediate pressure range 44 can be continuous or discontinuous pressure ranges 44 exhibit. It is done for operating situations with differing print image length L _B depending on the respective print image length L _B or an information I representing this length ( L _B ) on and off the squeegee 34 in a particular cycle Z1 ; Z2 in which the differing print image lengths L _B mutually different phase lengths for the respective phase P _AN with an employee squeegee 34 or different phasing for the end of each phase P _AN with an employee squeegee 34 are assigned. The phase position for the beginning of the respective phase P _AN with an employee squeegee 34 can each have a same and z. B. fixed, but may be changed if necessary. This can, for example, in the manner outlined above, even before the start of the usable for printing peripheral portion U _N lie. The phase position for the beginning of the respective phase P _AN with an employee squeegee 34 In this case, as above, each may be a same or a phase position dependent on the print image beginning.

In a third, possibly instead of or optionally to the first and / or second embodiment feasible or providable embodiment, for. In 8th schematically based on a side view of a usable peripheral portion U _D comprehensive cylinder jacket processing indicated, can per cycle length L _Z several phases P _AN with an employee squeegee 34 and several phases P _AB with an employee squeegee 34 be provided. This is a beginning and an end of the respective phases P _AN with an employee squeegee 34 by the control device 39 in dependence on information I (M), which determines the phase position, as viewed in the transport direction, of printed strips interrupted by strips which are not to be printed 46 a print area 44 represent. There is an individual, depending on the particular distribution of the pressure strip for operating situations with divergent pattern of to be printed and not to be printed stripes 46 or from an information I (M) representing this distribution, a multiple activation and deactivation of the doctor blade 34 in a respective cycle, in which the one in the distribution of the pressure strip 46 deviating pressure ranges 44 different patterns for the phase positions and / or lengths, ie the location of the respective beginnings and ends, the respective phase P _AN with an employee squeegee 34 are assigned. The information I (M) on the number and / or position of the printing strips 46 For example, based on data obtained by evaluation of the pressure point 06 ; 07 to be printed image, in particular by evaluation of z. B. are obtained in the prepress stage in data form target printed image or are. In this case, to be printed strip, which can be replaced by z. B. narrower unprintable strips are interrupted despite their discontinuity to larger pressure strip 46 be summarized or become.

In particular, in connection with the first and the second embodiment is by the control means 43 within the preferably fixed cycle length L _Z a ratio between the relative to the length of the swept inner circumference on the screen printing phase phase length of the Anstelllage "AN" phase in question P _AN and the parking space "AB" phase P _AB variable

The on-and-Abstellbewegung in the above embodiments enabling storage and drive device of the doctor 34 In principle, it can be of any desired design, provided it preferably has at least one doctor blade which can be suitably turned on and off 34 and one of the rotary drive of the screen printing cylinder 18 ; 22 and / or the counter-pressure and / or transport cylinder 21 mechanically independently operable and / or operated drive 41, 48 includes. This is for example - in particular without mechanical coupling to the drive of the screen printing cylinder 18 ; 22 or the counter-pressure and / or transport cylinder 21 - Optionally in a Anstelllage "ON" the squeegee 34 causing operating state BZ _AN and in a the Abstelllage "AB" the squeegee 34 causing operating state BZ _AB available (see eg 5b )) with 5a)).

The of the rotary drive of the screen printing cylinder 18 ; 22 and / or the counter-pressure and / or transport cylinder 21 mechanically independently operated and / or operable and / or without mechanical drive coupling to the rotary drive of the screen printing cylinder 18 ; 22 and / or the counter-pressure and / or transport cylinder 21 trained drive 41 . 48 In principle, it can be configured as desired to turn the squeegee on and off 34 to allow in the manner mentioned. In doing so, the type of movement of the squeegee 34 and / or the design of the drive basically be executed arbitrarily. The following examples reflect particularly advantageous embodiments, but should not necessarily limit the functionally underlying solution.

Such a drive 41 . 48 comprises at least one controllable drive means 41 , This can, for example, as a actuatable by the application of a pressurized fluid drive means 41 , such as As a pressurizable with pressurized fluid cylinder-piston system, such as a hydraulic or pneumatic cylinder drive, or-as preferred here - as a - preferably angular position adjustable - engine 41 , such as B. an electric motor 41 , for example as a linear motor or as a rotary electric motor 41 be trained.

The drive means 41 is the output side medium or directly via a corresponding coupling with the squeegee to be moved 34 in active connection. The active compound can be directly without any gear or gear 48 on the squeegee 34 Act.

Such a transmission can in a first embodiment z. B. by a linear movement of a linearly acting drive means 41 , z. B. an actuatable with a pressurized fluid drive means 41 , in an on / Abstellbewegung the doctor 34 transmitting gear 48 , For example, comprising a plunger and / or a one or two-armed lever, be formed. In another advantageous embodiment of the drive, the coupling via a rotational movement of a rotationally acting drive means 41 , z. B. an electric motor 41 , in an on / Abstellbewegung the doctor 34 changing gear 48 be done or realized. In a third, advantageous embodiment, the drive can be designed as a linear drive, and the transmission 48 as a rotary rotor movement of a - preferably angular position controlled trained - electric motor 41 in a linear motion of a squeegee 34 carrying vehicle transforming gear 48 , z. B. a spindle gear, be executed.

When screen printing can be a pressure-on "DN" in the nip 06 ; 07 basically also be done by moving the squeegee 34 in their Anstelllage "AN" within certain limits elastic and / or deformable round screen as a screen printing 31 ; 32 from one to the lateral surface 27 spaced position in touching contact with the impression cylinder 21 is spent. In preferred embodiment here are the screen printing form 31 ; 32 and the squeegee 34 independently adjustable. It is for moving between pressure-on "DN" and pressure-Ab "DB" of the screen cylinder 18 ; 22 another, from the above drive means 41 different drive means 49 , z. B. an engine 49 , in particular electric motor 49 , or a fluid-operated drive means 40 such as a pneumatic cylinder 49 , intended. This can, for example, as a drive fluid actuated by pressurized fluid 41 , z. As a hydraulic or pneumatic cylinder, be designed as an electric motor or in any other way.

In addition to the control device 39 through which the squeegee 34 in the above-mentioned correlation to the machine phase of the printing press and / or to the progress of the printing material 02 is turned on and off and is turned on and off, and for example, a above, the substrate feed and / or the machine phasing supplying master 42 , are control means 51 provided by which the on and off of the screen cylinder 18; 22 via appropriate control of the drive means 41 is effected, for example, by the control means 51 forth the drive means 49 a corresponding signal is supplied. An advantage may be an embodiment, wherein the entire actuating mechanism for the doctor blade 34 when placing the screen cylinder 18 ; 22 is moved with this. This can be avoided, for example, that the screen printing form 31 ; 32 when parking the screen cylinder 18 ; 22 in the otherwise possibly remaining stationary doctor blade 34 is pressed into it.

From the control means 51 can also be the controller 39 a squeegee mode switching signal will be supplied. Through this is For example, a permanent or cyclic hiring outlined above can be activated and deactivated.

In particular, by the execution in which the on and off the squeegee 34 and the pressure-on and pressure-off the screen cylinder 18 ; 22 can be effected independently, is a particularly preferable mode of operation of the printing unit 19 ; 23 when starting or restarting the machine or the printing unit 19 ; 23 feasible. Here is a contamination of the surface of the impression cylinder 21 through from the screen cylinder 31 ; 32 originating printing ink largely prevented, or at least significantly reduced. Especially in situations in which, although still or already ink in the screen cylinder interior, but still no decrease in color by printing substrate 02 takes place, can accumulate on the Siebaußenseite percolating ink, which subsequently to color deposits on the outer surface 27 the impression cylinder 21 lead and there can lead to damage or at least excessive cleaning.

For example, already for the following production in the screen cylinder 18 ; 22 introduced or in production interruption still remaining ink seep through the pores. This is especially true if the not yet employed or still parked screen cylinder 18 ; 22 with the squeegee off 34 already or still rotates. Due to the centrifugal forces, the ink can be pushed even more through the pores.

The undesirable manner on the outside accumulating ink can, for. B. by appropriate construction over several revolutions, for example, at more than three revolutions, one with respect to the pressure-Ab DB formed gap width greater layer thickness, so that they at least partially on the lateral surface 27 the impression cylinder 21 can get. Also, at the start of printing, ie after the removal of the screen cylinder 18 ; 22 in pressure on and the squeegee 34 , on the Siebaußenfläche a paint roller are formed, in the worst case, not from the substrate 02 can be taken and transported to the end of the sheet. There, the residual color on the surface of the impression cylinder 21 distributed. Of particular disadvantage are such color impurities on the impression cylinder 21 for the above-mentioned case that a drying device 36 , in particular an intermediate dryer 36, on the lateral surface 27 directed and, for example, not be deactivated for the startup.

To avoid such contamination, the startup or restarting or driving on after a trouble-related hiring the screen cylinder 18; 22 after the following steps:

Starting from a here referred to as the first phase operating situation, in which the screen cylinder 18 ; 22 with the squeegee off 34 from the impression cylinder 21 is turned off, in a following, z. B. second phase one or more sheets of printing material 02 with still off doctor blade 34 with - preferably per printing material sheet 02 - At least temporarily hired screen cylinder 18 ; 22 through the pressure point 06 ; 07 promoted. In this case, the screen cylinder 18 ; 22 for example, in the presence of above-described openings 28 in the lateral surface 27 the impression cylinder 21 in the area of the openings 28 be lifted and then hired again. In a following, for. B. third phase finally takes place for subsequent printing material 02 an operation with permanently or preferably in the manner outlined above cyclically per printing material sheet 02 at least once employed squeegee 34 he follows. The latter is said to be unlike a squeegee-free operation 34 as well as the permanently employed squeegee 34 to act a commercial doctor blade operation. As a rule, during or at least towards the end of the first phase, printing ink is still or already in the screen cylinder 18 ; 22 which gives rise to the danger of above-mentioned impurities.

The Anstellsequenz of screen cylinder 18 ; 22 and squeegee 34 This is done in such a way that only one or more revolutions of the screen is made first. During this time, the printing ink on the outside of the screen printing form 31 ; 32 on the substrate 02 transfer. When placing the squeegee 34 then there is only so much ink on the outside of the screen printing form 31 ; 32 that the printing material 02 The amount of paint can also absorb and no more paint roller in the Nippstelle 06 ; 07 can build up. Although this procedure can lead to a higher number of spoil sheets at the start of printing, but helps complex cleaning processes of the impression cylinder 21 to reduce or avoid.

In the second phase, one or more printing material sheets 02 will preferably be or become in each case at least temporarily screen cylinder 18 ; 22 through the pressure point 06; 07 promoted while the squeegee 34 remains parked for the duration required for this purpose.

In particular, in the second phase in this way two to nine, preferably two to six sheets of printing material 02 in each case at least temporarily employed Siebzylinder 18 ; 22 through the pressure point 06 ; 07 promoted while the squeegee 34 remains parked for the duration required for this purpose, so is not employed in doctor blade operation permanently or cyclically or is.

The remaining in the second phase when left squeegee 34 through the pressure point 06 ; 07 subsidized substrate sheet 02 be downstream of the screen printing unit 19 ; 23 preferably separated as spoil sheet of the voucher, in particular discharged and / or collected separately.

In an advantageous embodiment, a fixed but preferably predetermined number of at least one, in particular a number of one to three, first in the third phase when employed squeegee 34 with employed screen cylinder 18 ; 22 through the pressure point 06 ; 07 subsidized substrate sheet 02 regardless of their quality as a waste sheet separated from the voucher, in particular discharged and / or collected separately.

In a first variant for the starting position in the first phase is the screen cylinder 18 ; 22 and / or the impression cylinder 21 at standstill, and is accelerated in an initial phase lying between first and second phase to an operating speed and operated at this operating speed, at least until further notice. This initial situation exists, for example, if, as planned or as a result of an error, an interruption of production with, for example, a shutdown of the machine to standstill, has taken place.

In a possible second variant for the initial position of the screen printing cylinder 18; 21, for example, only for a shorter period of time, be parked without the machine and / or the screen cylinder 18 ; 22 is actually brought to a standstill. In the event of a possibly after the shutdown of the screen cylinder 18 ; 22 initially compared to a desired low operating speed higher speed, this is lowered in a lying between the first and second phase braking phase to the lower operating speed and then operated with the possibly previously present or achieved after reduction lower operating speed, at least until further notice.

Said lower operating speed referred to or achieved in the second phase is significantly lower than the production target speed, ie at least one third of the production target speed. For example, it corresponds at most to a sheet conveying rate through the printing area 06 ; 07 of up to 4,000 sheets / hour, in particular from 2,000 to 4,000 sheets / hour.

Vorzugseise the screen cylinder 18 ; 22 and / or the impression cylinder 21 in the course of the second and / or the third phase to a previously compared lower operating speed to a contrast by at least half larger and / or at least a Bogenförderrate by the pressure point 06 ; 07 of at least 6,000 bph accelerates corresponding production target speed.

For the application that the first, second and third phase comprehensive operation takes place in the context of a recording or resumption of production, between the first and second phase is preferably a sheet feed to the press by the sheet feeder 01 synchronized to the angular position and / or speed of the impression cylinder 21 recorded, with the second phase with the hiring of the screen cylinder 18 ; 22 to one, z. B. the first of the sheet feeder 01 as part of a recording or resumption in the pressure point 06 ; 07 subsidized substrate sheet 02 starts.

Preferably, the number of machine revolutions, in particular at least the Siebzylinderumdrehungen before the first printing material sheet at startup or restarting the machine 02 Printed is reduced to a minimum. In addition, the machine speed preferably only after the start of printing, so after hiring the screen cylinder 18 ; 22 and the squeegee 34 , increased to production speed. As a result, in less time with the lowest possible centrifugal force less ink from the inside through the screen printing form 31 . 32 pushed outward.

The resumption of production has been preceded by, for example, a production shutdown due to an error and a machine shutdown with controlled shutdown. As a result of a detected error, eg. B. a investment error in the sheet feeder 01 , z. As a lowering of the machine speed, in particular the speed of the screen and / or impression cylinder 18 ; 21 ; 22 On the other hand, from production speed to one significantly, ie by at least one third of the production target speed, reduced and / or at most one sheet feed rate through the printing area 06 ; 07 operating speed of up to 4,000 sheets / hour. Another supply of substrate sheet 02 through the sheet feeder 01 is stopped, for example. Already in the transport path of the printing machine located printing material 02 , z. B. a number from two to fifteen, are still by the pressure point 06 ; 07 promoted and with the reduced operating speed for product delivery 04 , After filing the last printing material sheet 02 in the product display 04 can stop the machine thoroughly.

Preferably, the doctor blade is switched off 34 even before parking the screen printing cylinder 18 ; 22 , Although only a few seconds in between or even tenths of a second, it may be advantageous in a development when a shutdown of the screen printing cylinder 18 ; 22 only after it has been done with the squeegee off 34 at least with a large part, z. B. more two-thirds of its circumference on a by the pressure point 06 ; 07 subsidized substrate sheet 02 is unrolled.

In the case of a planned or controlled machine stop (for example, at the end of production or in the case of a production interruption, which can be due to errors, for example, plant errors or production schedule-related), then the machine speed - especially during the last printing material sheet 02 - with an employee squeegee 34 preferably reduced as much as possible. The sheet transport from the printing nip to the delivery takes place at a reduced operating speed. As a result, with less centrifugal force and less ink from the inside through the screen printing form 31 ; 32 pushed outward.

Although for the doctor blade operation in the said method, a permanent hiring or mechanically coupled to the impression cylinder angular position cyclic on and off can be provided, is preferably the above for turning on and off the squeegee 34 by a mechanically independent of the rotary drive drive means 41 to be used for squeegee drive.

Also, the procedure is both on a drive of the printing press and / or the screen printing with jointly driven by a drive coupling cylinders 18 ; 21 ; 22 , as well as to a version with individually or group-driven cylinders 18 ; 21 ; 22 apply. For example, in an advantageous embodiment of the screen printing cylinder 18 ; 22 independent of the impression cylinder 21 be driven, resulting in the shutdown of the machine with already off screen printing cylinder 18 ; 22 its after-running and / or when starting the machine with screen printing cylinder still turned off 18 ; 22 shorten its forerunners. This also reduces the impurities.

The device for operating a screen printing unit 19 ; 23 In the above manner, the above-mentioned control means 51 which the screen cylinder 18 ; 22 after a first phase, in which he is with the squeegee off 34 from the impression cylinder 21 turned off, in a second phase with permanently shut off squeegee 34 in the course of the passage of one or more sheets of printing material 02 through the pressure point 06 ; 07 per printing material sheet 02 at least in part, and in a subsequent third phase, in particular production phase, for a number, in particular a plurality of z. B. more than 20, of printing material sheet 02 the squeegee 34 permanent or per printing material sheet 02 at least once from the inside against the screen printing form 31 ; 32 hires. The device and / or the control means 51 for this purpose, ie includes a control routine, for example as a software program in by the control means 51 encompassed data processing means.

LIST OF REFERENCE NUMBERS

01

Feeding device, sheet feeder

02

Substrate, substrate sheet

03

pressure unit

04

product display

05

-

06

Pressure point, Nippstelle

07

Pressure point, Nippstelle

08

gripper

09

Conveyor line, belt system, conveyor system

10

-

11

Transfer drum

12

transfer drum

13

Conveyor line, belt system

14

Conditioning device, drying device

15

-

16

Conditioning device, drying device

17

Conditioning device, device for applying magnetic field lines

18

Rotary body, cylinder, forme cylinder, sieve cylinder, screen-printing cylinder

19

Printing unit, screen printing unit

20

-

21

Rotary body, cylinder, counter-pressure and / or transport cylinder

22

Rotary body, cylinder, forme cylinder, sieve cylinder, screen-printing cylinder

23

Printing unit, screen printing unit

24

Holding device, gripper device

25

-

26

pit

27

lateral surface

28

Opening, pit opening

29

Dyeing aid, cover element, flap

30

-

31

Printing form, screen printing form, screen printing stencil

32

Printing form, screen printing form, screen printing stencil

33

doctor device

34

doctor

35

signal connection

36

Drying unit, dryer, intermediate dryer, radiation dryer

37

Shading, wall

38

radiation source

39

Control device, control circuit, data processing means

40

-

41

Drive means, motor, electric motor

42

Master axis encoder, master, master axis, sensors, drive control

43

control means

44

pressure range

45

signal connection

46

pressure strips

47

Planning and / or management level

48

Transmission,

49

Drive means, motor, electric motor, pneumatic cylinder

50

51

-

52

control means

53

Calculating and / or storage means

a _AN

distance

a _AB

distance

a _s

distance

FROM

removed area

AT

contact position

BZ _AB

operating condition

BZ _AN

operating condition

DB

Print-off

DN

Print-on

F.1

format

F.2

format

I

information

L02,1

Bedruckstofflänge

L02,2

Bedruckstofflänge

L _B

Image length

L _D

length

L _Z

cycle length

L _N

length

P _from

phase

P _on

phase

P _AB

phase

P _AN

phase

S _K

signal

S _R

signal

U _D

Peripheral section, cylinder peripheral section (usable for pressure)

U _N

Peripheral section, cylinder peripheral section (not usable for pressure)

Z1

cycle

Z2

cycle

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2016/102187 A1 [0002]

Claims (20)

Method for operating a screen printing unit (19; 23) in a printing press with a screen cylinder (18; 22) carrying a screen printing form (31; 32) in which a doctor blade (34) against the screen printing form (31; is abstellbar, and which against a counter-pressure cylinder (21) to form a pressure point (06; 07) engageable and from this with the formation of a gap of this can be turned off, wherein - The screen cylinder (18, 22) is turned off in a first phase with the squeegee (34) off the impression cylinder (21), in a second phase, one or more printing material sheets (02) are conveyed through the printing location (06, 07) while the doctor blade (34) is still set down with at least temporarily employed screen cylinders (18; - Before finally for subsequent printing material sheet (02) in a third phase, an operation with permanent or cyclic per printing material sheet (02) at least once employed squeegee (34). Method according to Claim 1 , characterized in that in the second phase one or more printing material sheets (02) are conveyed through the printing location (06, 07) in each case at least temporarily employed screen cylinder (18, 22), while the squeegee (34) is required for this purpose Duration stays off. Method according to Claim 2 , characterized in that in the second phase two to nine, preferably two to six printing material (02) in each case at least temporarily employed Siebzylinder (18; 22) through the pressure point (06 07) are promoted while the doctor (34) for the required duration remains parked. Method according to Claim 1 . 2 or 3 , characterized in that during or at least towards the end of the first phase towards printing ink in the screen cylinder (18; 22) is located. Method according to Claim 1 . 2 . 3 or 4 , characterized in that in the second phase when the remaining squeegee (34) through the printing point (06; 07) funded printing material (02) downstream of the screen printing unit (19; 23) separated as waste sheet of the voucher, in particular discharged and / or collected separately. Method according to Claim 1 . 2 . 3 . 4 or 5 , characterized in that a fixed but preferably predeterminable number of at least one, in particular a number of one to three, first in the third phase when employed squeegee (34) with employed screen cylinder (18; 22) by the pressure point (06; 07) subsidized printing material sheet (02) regardless of its quality as a spoiler sheet separated from the voucher, in particular discharged and / or collected separately, or will be. Method according to Claim 1 . 2 . 3 . 4 . 5 or 6 , characterized in that the screen cylinder (18; 22) and / or the counter-pressure cylinder (21) is in the first phase at a standstill, accelerated to an operating speed in a starting phase lying between the first and second phase and at this operating speed at least until further notice is operated. Method according to Claim 7 , characterized in that the operating speed present or reached in the second phase is significantly lower than the production target speed, ie at least one third of the production target speed, and / or at most one sheet feed rate through the pressure point (06; 07) of up to 4,000 sheets / hour equivalent. Method according to Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 or 8th , characterized in that the screen cylinder (18; 22) and / or the counter-pressure cylinder (21) in the course of the second and / or the third phase to a comparison with the previously assumed lower operating speed to a contrast by at least half larger and / or at least a sheet conveying rate is accelerated by the printing point (06; 07) of at least 6,000 sheets / hour corresponding production target speed. Method according to Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8th or 9 , characterized in that the first, second and third phase comprehensive operation takes place in the context of a recording or resumption of production. Method according to Claim 10 , characterized in that between the first and second phase, a sheet feed to the printing press by a sheet feeder (01) synchronized with the angular position and / or speed of the impression cylinder (21) is recorded and the second phase with the employment of the screen cylinder (18; 22) to the first of the sheet feeder (01) ago in the context of a recording or resumption in the printing point (06; 07) funded printing material sheet (02) begins. Method according to Claim 10 or 11 , characterized in that the resumption of production is preceded by an erroneous production interruption and a machine shutdown with controlled shutdown. Method according to Claim 12 , characterized in that as a result of a detected error lowering the speed of the screen and / or impression cylinder (18; 21; 22) of production speed on a contrast significantly, ie by at least one third of the production target speed, reduced and / or at most one sheet conveying rate the printing location (06; 07) of up to 4,000 sheets / hour corresponding operating speed and / or a further supply of printing material (02) is stopped by the sheet system. Method according to Claim 13 , characterized in that the already located in the transport path of the printing press substrate sheet (02) by further operation of the printing press or the still substrate sheet (02) leading section to the delivery (04) are promoted and after filing of the last printing material sheet (02) in the display (04) the machine is stopped completely. Method according to Claim 12 . 13 or 14 , characterized in that a shutdown of the doctor blade (34) even before the shutdown of the screen cylinder (18; 22) takes place. Method according to Claim 15 Characterized in that parking of the screen cylinder (18; 22) is given after it in parked doctor blade (34) with at least a major part of its periphery on a through the printing position (06; 07) is unrolled conveyed printing material (02). Method according to Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 11 . 12 . 13 . 14 . 15 or 16 , characterized in that in operation with cyclically per printing material sheet (02) at least once employed squeegee (34) on and off a squeegee (34) to a screen printing form (31; 32) in a repeating, a sequence with one or more an attack position ("ON") relevant phases (P _AN ) and one or more a Abstelllage ("AB") pertinent phases (P _AB ) cycle takes place. Method according to Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 11 . 12 . 13 . 14 . 15 . 16 . 17 or 18 , characterized in that the on and off of the doctor blade (34) by a mechanically by the rotary drive of the screen cylinder (18; 22) and / or counter-pressure cylinder (21) independent drive means (41). Apparatus for operating a screen printing unit (19; 23) in a printing press, in particular for use in a method according to any one of Claims 1 to 19 , with a screen cylinder (18; 32) carrying a screen cylinder (18; 22) in which a doctor blade (34) by a drive means (41) from the inside against the screen printing form (31; 32) is switched on and off, and which a drive means (49) which is different from the first drive means (41) and which can be set against a counter-pressure cylinder (21) to form a pressure point (06; 07) and which can be shut off from the latter by forming a gap, wherein a drive means (41; Signaling means connected control means (51) is provided, which the screen cylinder (18; 22) by driving the second drive means (49) after a first phase in which it is parked with off blade (34) from the impression cylinder (21), in a second Phase at permanently shut off blade (34) in the course of the passage of one or more printing material sheet (02) by the pressure point (06; 07) per printing material sheet (02) at least partially sets hues, and in a subsequent third phase for a number of printing material (02) by actuating the first drive means (41) the doctor blade (34) permanently or per printing material sheet (02) at least once from the inside against the screen printing form (31; 32). Device after Claim 19 , characterized in that the device and / or the control means (51) is arranged, the screen cylinder (18; 22) after a first phase in which it is parked with off blade (34) from the impression cylinder (21) in a second Phase at permanently shut off doctor blade (34) in the course of the passage of one or more printing material (02) by the pressure point (06; 07) per printing material (02) at least partially make and in a subsequent third phase for a number of subsequent printing material (02) Squeegee (34) permanently or per printing material sheet (02) at least once from the inside against the screen printing form (31, 32) to make.

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